Chewie,
Sculpting is frustrating for me, I find it very hard to do it entirely from scratch. If I could make a suggestion though, it would be to try and find a head with a similar hair line around the face that you could blend you rsculpt into. The thich dreadlocks on yours are a step in the right direction, but the hair on the top of the head really sort of just sits there... maybe there's a head (or seperate hair piece like on Agen Kolar, or whoever the long haired Jedi from ROTS is) that you could sclupt on top of...